Lost in the glow: navigating the crisis of light and wildlife
It is time to recognise artificial lighting at night as a legally defined form of disturbance in the Environmental (Protection) Act, 1986, and mandate light impact assessment for all development activities in and around key ecological zones as well as high-value biodiversity areas
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Context
The article highlights the growing environmental crisis of light pollution, or Artificial Light at Night (ALAN), driven by the widespread use of energy-efficient LEDs. It details the severe ecological consequences, from disorienting migratory species to increasing human-wildlife conflict. The author proposes a comprehensive policy framework, using Kerala as a model, to mitigate these impacts and suggests formally recognizing light pollution under India's primary environmental law.
UPSC Perspectives
Environmental
Light pollution is an emerging ecological threat that disrupts ecosystems which have evolved over millennia under natural light-dark cycles. The article notes that ALAN alters the behavior, physiology, and reproductive patterns of diverse species. For instance, migratory birds and sea turtle hatchlings are disoriented by city lights, leading to increased mortality. The constant glow disrupts predator-prey dynamics, giving an advantage to light-adapted predators and negatively impacting nocturnal species. It also triggers trophic cascades (indirect effects of a predator on lower trophic levels) in aquatic ecosystems by altering zooplankton migration, leading to algal blooms and degraded water quality. The article advocates for ecological lighting standards and the creation of 'dark corridors' and 'dark zones' to reconnect fragmented habitats and preserve nocturnal biodiversity. This is crucial for conservation in biodiversity hotspots like the Western Ghats.
Governance & Polity
A significant governance gap exists in India regarding light pollution. The article argues for its formal recognition as a pollutant under the [Environment (Protection) Act, 1986]. Currently, there is no specific statutory framework in India to regulate ALAN. The Central Pollution Control Board (CPCB) has itself acknowledged this legal vacuum before the . The definition of an 'environmental pollutant' in Section 2(b) of the Act refers to any 'solid, liquid or gaseous substance', which does not explicitly cover light—a form of energy. Amending the Act would provide a legal basis for mandating Light Impact Assessments for development projects in ecologically sensitive areas. Furthermore, the Supreme Court has interpreted the [Article 21] (Right to Life) to include the right to a healthy environment, which could be judicially extended to include the right to be free from light pollution. The article's call for a state-level policy in Kerala exemplifies a bottom-up approach to environmental governance, which can serve as a model for a national framework.
Socio-Economic
The issue of light pollution involves a complex trade-off between development, safety, and ecological health. While artificial lighting is associated with economic activity and public safety, its inappropriate use leads to negative externalities. From a health perspective, excessive blue light from LEDs suppresses melatonin production, disrupting human circadian rhythms and sleep cycles, which has been linked to various health issues. Economically, inefficient and excessive lighting represents significant energy wastage, contradicting the goals of energy efficiency often cited for LED adoption. The proposed solutions, such as adaptive lighting with motion sensors and dimming capabilities, offer a win-win scenario by reducing both energy consumption and ecological harm. The article also points towards an economic opportunity in 'astro-tourism' by creating Dark Sky Reserves, which can attract niche tourism and create sustainable livelihoods while preserving natural darkness. This aligns with the broader goal of sustainable development, which seeks to balance economic growth with environmental protection.